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Diffstat (limited to 'rts/gmp/mpz/mul.c')
| -rw-r--r-- | rts/gmp/mpz/mul.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/rts/gmp/mpz/mul.c b/rts/gmp/mpz/mul.c new file mode 100644 index 0000000000..7854788e50 --- /dev/null +++ b/rts/gmp/mpz/mul.c @@ -0,0 +1,131 @@ +/* mpz_mul -- Multiply two integers. + +Copyright (C) 1991, 1993, 1994, 1996, 2000 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Lesser General Public License as published by +the Free Software Foundation; either version 2.1 of the License, or (at your +option) any later version. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public +License for more details. + +You should have received a copy of the GNU Lesser General Public License +along with the GNU MP Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include <stdio.h> /* for NULL */ +#include "gmp.h" +#include "gmp-impl.h" +#ifdef BERKELEY_MP +#include "mp.h" +#endif + +#ifndef BERKELEY_MP +void +#if __STDC__ +mpz_mul (mpz_ptr w, mpz_srcptr u, mpz_srcptr v) +#else +mpz_mul (w, u, v) + mpz_ptr w; + mpz_srcptr u; + mpz_srcptr v; +#endif +#else /* BERKELEY_MP */ +void +#if __STDC__ +mult (mpz_srcptr u, mpz_srcptr v, mpz_ptr w) +#else +mult (u, v, w) + mpz_srcptr u; + mpz_srcptr v; + mpz_ptr w; +#endif +#endif /* BERKELEY_MP */ +{ + mp_size_t usize = u->_mp_size; + mp_size_t vsize = v->_mp_size; + mp_size_t wsize; + mp_size_t sign_product; + mp_ptr up, vp; + mp_ptr wp; + mp_ptr free_me = NULL; + size_t free_me_size; + mp_limb_t cy_limb; + TMP_DECL (marker); + + TMP_MARK (marker); + sign_product = usize ^ vsize; + usize = ABS (usize); + vsize = ABS (vsize); + + if (usize < vsize) + { + /* Swap U and V. */ + {const __mpz_struct *t = u; u = v; v = t;} + {mp_size_t t = usize; usize = vsize; vsize = t;} + } + + up = u->_mp_d; + vp = v->_mp_d; + wp = w->_mp_d; + + /* Ensure W has space enough to store the result. */ + wsize = usize + vsize; + if (w->_mp_alloc < wsize) + { + if (wp == up || wp == vp) + { + free_me = wp; + free_me_size = w->_mp_alloc; + } + else + (*_mp_free_func) (wp, w->_mp_alloc * BYTES_PER_MP_LIMB); + + w->_mp_alloc = wsize; + wp = (mp_ptr) (*_mp_allocate_func) (wsize * BYTES_PER_MP_LIMB); + w->_mp_d = wp; + } + else + { + /* Make U and V not overlap with W. */ + if (wp == up) + { + /* W and U are identical. Allocate temporary space for U. */ + up = (mp_ptr) TMP_ALLOC (usize * BYTES_PER_MP_LIMB); + /* Is V identical too? Keep it identical with U. */ + if (wp == vp) + vp = up; + /* Copy to the temporary space. */ + MPN_COPY (up, wp, usize); + } + else if (wp == vp) + { + /* W and V are identical. Allocate temporary space for V. */ + vp = (mp_ptr) TMP_ALLOC (vsize * BYTES_PER_MP_LIMB); + /* Copy to the temporary space. */ + MPN_COPY (vp, wp, vsize); + } + } + + if (vsize == 0) + { + wsize = 0; + } + else + { + cy_limb = mpn_mul (wp, up, usize, vp, vsize); + wsize = usize + vsize; + wsize -= cy_limb == 0; + } + + w->_mp_size = sign_product < 0 ? -wsize : wsize; + if (free_me != NULL) + (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB); + TMP_FREE (marker); +} |